<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
            position: relative;
            width: 600px;
            border-bottom: 1px solid #ccc;
            margin: 100px auto;
        }
        .box input {
            width: 370px;
            height: 30px;
            border: 0;
            outline: none;
        }
        .box img {
            position: absolute;
            top: 10px;
            right: 10px;
            width: 24px;
            
        }
    </style>
</head>
<body>
    <div class='box'>
        <label for="">
            <img src="images/close.png" alt="" id="eye">
        </label>
        <input type="password" name="" id="pwd">
    </div>
    <script>
       var eye = document.getElementById('eye');
       var pwd = document.getElementById('pwd');
       var flag = 0;
       eye.onclick = function() {
           if(flag ==0 ){
               pwd.type = 'txet';
               eye.src = 'images/open.png';
               flag=1;
           }else {
               pwd.type = 'password';
               eye.src = 'images/close.png';
               flag = 0;
           }
       }
    </script>
</body>
</html>